<template>
	<view>
		<!-- 使用自定义搜索组件 -->
		<my-search @myGoSearch='goSearch'></my-search>
		<view class="scroll-view-container">
			<scroll-view class="scroll-view-left" scroll-y="true" :style="{height: wh + 'px'}">
				<block v-for="(item,index) in cateList" :key="index" >
					<view :class="['scroll-view-left-item',index === active ? 'active' : '']" @click="checkActive(index)">{{item.cat_name}}</view>
				</block>
			</scroll-view>
			<scroll-view class="scroll-view-right" scroll-y="true" :style="{height:wh + 'px'}" :scroll-top="scrollTop">
				<view class="cate-lv2" v-for="(item2, i2) in cateLevel2" :key="i2">
					<view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
					<!-- 动态渲染三级分类的列表数据 -->
					<view class="cate-lv3-list">
					<!-- 三级分类 Item 项 -->
						<view class="cate-lv3-item" v-for="(item3, i3) in item2.children"
						:key="i3" @click="gotoGoodsList(item3)">
							<!-- 图片 -->
							<image :src="item3.cat_icon"></image>
							<!-- 文本 -->
							<text>{{item3.cat_name}}</text>
						</view>
					</view>
				</view>
			</scroll-view>
		</view>
	</view>
</template>

<script>
	import badgeMix from '@/mixins/tabbar-badge.js'
	export default {
		mixins:[badgeMix],
		data() {
			return {
				// 0
				wh:0,//保存屏幕可使用的高度
				cateList: [],// 分类数据列表
				active:0,//默认第一个被选中
				cateLevel2: [],//二级分类列表
				scrollTop:0,//设置滚动条的位置
			};
		},
		onLoad() {
			// let info = uni.getSystemInfoSync().windowHeight
			// console.log('info',info)
			this.wh = uni.getSystemInfoSync().windowHeight - 50
			this.getCateList()
			
		},
		methods:{
			goSearch(e){
				console.log('父组件',e)
				uni.navigateTo({
					url:'/subpkg/search/search'
				})
			},
			// 点击三级分类项跳转到商品列表页面
			gotoGoodsList(item3) {
				uni.navigateTo({
				url: '/subpkg/goods_list/goods_list?cid=' + item3.cat_id
				})
			},
			checkActive(index){
				this.active = index
				this.cateLevel2 = this.cateList[index].children
				this.scrollTop = this.scrollTop === 0 ? 1 : 0
			},
			async getCateList(){
				let {data:res} = await uni.$http.get('/api/public/v1/categories')
				// console.log("res",res)
				// data为获取的数据，res为结构出来的数据
				if (res.meta.status !== 200) return uni.$showMsg()
				// 转存数据
				this.cateList = res.message
				this.cateLevel2 = res.message[0].children
				this.scrollTop = 0
			}
		}
	}
</script>

<style lang="scss">
	
.scroll-view-container{
	display: flex;
	
		
	.scroll-view-left{
		width: 120px;
		.scroll-view-left-item{
			line-height: 60px;
			background-color: #f7f7f7;
			text-align: center;
			font-size: 12px;
			// 激活项的样式
			&.active {
				background-color: #ffffff;
				position: relative;
			// 渲染激活项左侧的红色指示边线
				&::before {
					content: ' ';
					display: block;
					width: 3px;
					height: 30px;
					background-color: #c00000;
					position: absolute;
					left: 0;
					top: 50%;
					transform: translateY(-50%);
				}
			}
		}
	}
	.scroll-view-right{
		
		.cate-lv2-title {
			font-size: 12px;
			font-weight: bold;
			text-align: center;
			padding: 15px 0;
		}
		.cate-lv3-list {
		display: flex;
		flex-wrap: wrap;
		.cate-lv3-item {
		width: 33.33%;
		margin-bottom: 10px;
		display: flex;
		flex-direction: column;
		align-items: center;
		image {
		width: 60px;
		height: 60px;
		}
		text {
		font-size: 12px;
		}
		}
		}
	}
}
</style>
